diff --git a/README.md b/README.md
index 1bee39036..1100f949c 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,34 @@
 
 <br>
 
+## 👀 기능 목록
+<숫자 생성>
+1. 숫자 랜덤 생성(1~9 범위의 3자리 자연수)
+2. 각 자리 숫자는 중복 허용 XX
+
+<입력>
+1.[예외] 숫자가 아닌 값을 입력받은 경우
+2.[예외] 3자리 자연수 아닌 경우
+3.[예외] 각 자릿수의 숫자중 중복된 값이 있는 경우
+4. [예외] 0 이하 음수인 경우
+5. [예외] IllegalArgumentException 발생 시킨 후 종료
+
+<힌트>
+1. 같은 자릿수에 숫자 일치 : 스트라이크
+2. 다른 자릿수에 숫자 일치 : 볼
+3. 다른 자릿수에 다른 수 : 낫싱
+
+<출력>
+1. 볼, 스트라이크 카운트 후 출력
+2. 출력 순서: n볼 m스트라이크
+3. m=3일 때(3 스트라이크) 게임 종료 문구 출력
+
+<종료조건>
+1. 재시작 - 숫자 랜덤 생성 메서드 호출부분으로 돌아감
+2. 입력 종료 - 게임 종료!
+
+<br>
+
 ## ✍🏻 입출력 요구사항
 
 ### ⌨️ 입력
diff --git a/src/main/java/baseball/Application.java b/src/main/java/baseball/Application.java
index 7f1901b8b..60b9e636c 100644
--- a/src/main/java/baseball/Application.java
+++ b/src/main/java/baseball/Application.java
@@ -1,7 +1,31 @@
 package baseball;
 
+import java.util.List;
+
+import service.ComputerRandomNum;
+import service.JudgeResult;
+import util.InputUtil;
+
 public class Application {
-    public static void main(String[] args) {
-        //TODO: 숫자 야구 게임 구현
-    }
+	public static void main(String[] args) {
+		//TODO: 숫자 야구 게임 구현
+		ComputerRandomNum clearNumber = new ComputerRandomNum();
+		InputUtil inputUtil = new InputUtil();
+		JudgeResult judge = new JudgeResult();
+
+		boolean again = true;
+
+		while (again){
+			List<Integer> computer = clearNumber.getComputerNumber();
+			String result = "";
+			while (!result.equals("3스트라이크")){
+				result = judge.judgement(computer, inputUtil.userNumber());
+				System.out.println(result);
+			}
+			System.out.println("3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+			again = inputUtil.replay();
+		}
+	}
+
+
 }
diff --git a/src/main/java/service/CompareNum.java b/src/main/java/service/CompareNum.java
new file mode 100644
index 000000000..e71f98687
--- /dev/null
+++ b/src/main/java/service/CompareNum.java
@@ -0,0 +1,26 @@
+package service;
+
+import java.util.List;
+
+public class CompareNum {
+	public int countBall(List<Integer> computer, List<Integer> user){
+		int result = 0;
+		for(int i = 0; i < user.size(); i++){
+			if(computer.contains(user.get(i))){
+				result += 1;
+			}
+		}
+		return result;
+	}
+
+	public int countStrike(List<Integer> computer, List<Integer> user){
+		int strike = 0;
+		for(int i = 0; i < user.size(); i++){
+			if(computer.get(i) == user.get(i)){
+				strike += 1;
+			}
+		}
+		return strike;
+	}
+
+}
diff --git a/src/main/java/service/ComputerRandomNum.java b/src/main/java/service/ComputerRandomNum.java
new file mode 100644
index 000000000..33bf3ef21
--- /dev/null
+++ b/src/main/java/service/ComputerRandomNum.java
@@ -0,0 +1,35 @@
+package service;
+
+import java.util.List;
+import java.util.ArrayList;
+import camp.nextstep.edu.missionutils.Randoms;
+
+public class ComputerRandomNum {
+	
+	private List<Integer> computerNumber;
+	
+	public ComputerRandomNum() {
+		computerNumber = setGameNumber();
+	}
+	
+	public List<Integer> getComputerNumber() {
+		return computerNumber;
+	}
+    public static int getComputerNum() {
+        return Randoms.pickNumberInRange(1, 9);
+    }
+
+    public List<Integer> setGameNumber() {
+    	List<Integer> computerNumber = new ArrayList<>();
+    	while (computerNumber.size() < 3) {
+    		int randomNumber = getComputerNum();
+    		if(computerNumber.contains(randomNumber)){
+    			continue;
+    		}else {
+    			computerNumber.add(randomNumber);
+    		}
+    	}
+    	return computerNumber;
+    }
+   
+}
diff --git a/src/main/java/service/JudgeResult.java b/src/main/java/service/JudgeResult.java
new file mode 100644
index 000000000..7a09c84da
--- /dev/null
+++ b/src/main/java/service/JudgeResult.java
@@ -0,0 +1,27 @@
+package service;
+
+import java.util.List;
+
+public class JudgeResult {
+	
+	CompareNum compare = new CompareNum();
+	
+    public String judgement(List<Integer> computer, List<Integer> player){
+        int total = compare.countBall(computer, player);
+        int strike = compare.countStrike(computer, player);
+        int ball = total - strike;
+        
+        String result = null;   
+        
+        if(total == 0){
+            result = "낫싱";
+        }else if(ball != 0 && strike == 0){
+        	result = ball + "볼";
+        }else if(strike != 0 && ball == 0){
+        	result = strike + "스트라이크";
+        }else {
+        	result = ball + "볼 " + strike + "스트라이크";
+        }
+        return result;
+    }
+}
diff --git a/src/main/java/util/InputException.java b/src/main/java/util/InputException.java
new file mode 100644
index 000000000..10427ff6c
--- /dev/null
+++ b/src/main/java/util/InputException.java
@@ -0,0 +1,50 @@
+package util;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class InputException {
+	private String inputNumber;	
+	
+	public InputException(String inputNumber) {
+
+		isStringLengthCorrect(inputNumber);
+		isDigitPlayerNumber(inputNumber);
+		isDifferentPlayerNumber(inputNumber);
+		
+		this.inputNumber = inputNumber;
+	}
+
+	public String getInputNumber() {
+		return inputNumber;
+	}
+
+	public static void isStringLengthCorrect(String word) throws IllegalArgumentException {
+        if (word.length() != 3) {
+            throw new IllegalArgumentException("잘못된 값을 입력하셨습니다. ");
+        }
+    }
+
+
+    public static void isDifferentPlayerNumber(String word) throws IllegalArgumentException {
+        Set<Character> set = new HashSet<>();
+
+        for (int i = 0; i < word.length(); i++) {
+            set.add(word.charAt(i));
+        }
+        if (set.size() != word.length()) {
+            throw new IllegalArgumentException("잘못된 값을 입력하셨습니다.");
+        }
+    }
+    public static void isDigitPlayerNumber(String word) {
+    	for (int i = 0; i < word.length(); i++) {
+    		isDigitCharInString(word, i);
+    	}
+    }
+
+    public static void isDigitCharInString(String word, int index) throws IllegalArgumentException {
+        if (!Character.isDigit(word.charAt(index))) {
+            throw new IllegalArgumentException("잘못된 값을 입력하셨습니다.");
+        }
+    }
+}
diff --git a/src/main/java/util/InputUtil.java b/src/main/java/util/InputUtil.java
new file mode 100644
index 000000000..0a10eba7c
--- /dev/null
+++ b/src/main/java/util/InputUtil.java
@@ -0,0 +1,31 @@
+package util;
+
+import java.util.List;
+import java.util.ArrayList;
+import camp.nextstep.edu.missionutils.Console;
+
+public class InputUtil {
+	
+		public List<Integer> userNumber() {
+	        System.out.print("숫자를 입력해주세요 : ");
+	        String input = Console.readLine();
+	        // 예외 처리 메서드 만들기....
+	        
+	        List<Integer> userNum = new ArrayList<>();
+			for(String number: input.split("")){
+				userNum.add(Integer.parseInt(number));
+			}
+	        return userNum;
+	    }
+
+	public boolean replay(){
+		System.out.println("게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+		String input = Console.readLine();
+		char answer = input.charAt(0);
+        if(answer == '1'){
+            return true;
+        }
+        return false;
+    }
+	
+}